Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9388b178ed781bb…

MALICIOUS

PDF

69.7 KB Created: 2020-12-31 14:55:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 39bae164da6c86332fb5de87d418db5d SHA-1: 8b9c0e1332ecd0ec71cd966772ee899cc16d6018 SHA-256: c9388b178ed781bb32a584f1b5011d844cae42d502eb158c0bb664f4cbd1c090
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The document contains numerous embedded URLs, many pointing to disposable hosting, forming a link farm. The primary malicious URL identified is https://gettraff.ru/strik?utm_term=electric+bell+circuit+diagram+explanation, which likely serves as a lure to redirect users to a phishing or malware-hosting site. No scripts were extracted, but the PDF structure and URL analysis strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gettraff.ru/strik?utm_term=electric+bell+circuit+diagram+explanation In PDF document text
    • https://bagubabijotete.weebly.com/uploads/1/3/4/3/134319258/943568.pdfIn PDF document text
    • https://mepopuwiv.weebly.com/uploads/1/3/4/4/134499337/6081687.pdfIn PDF document text
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/2c190cc61ace09.pdfIn PDF document text
    • https://kopiwuzurori.weebly.com/uploads/1/3/1/3/131398237/tizewilum.pdfIn PDF document text
    • https://zukamukenipebo.weebly.com/uploads/1/3/1/3/131380388/danoroko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368230/normal_5fa1691a1a8b0.pdfIn PDF document text
    • https://cdn.sqhk.co/nurofiwele/jigi8gi/japanese_katakana_translation.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468571/normal_5fdeca1f2edea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/mr_chow_knightsbridge.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/behaviour_management_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/fig_19_word_cookies_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/apb_full_form_in_vlsi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea061140-bfbc-40ca-8661-40a2df50e718/the_short_bus_mooney.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/81891410162.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/f220a_honda_tiller_manual.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EA 5380 bytes
SHA-256: d1aa9dcef33f3046916dc0437fddaeabd6272e3aa0179319b938cea1111b045d
font_01_sfnt_off0000e624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE624 10424 bytes
SHA-256: 81fc7d1d45742ca731ef1d8023b21b25acc1f8dd7789258ad72ac13ef59030d7

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